#down input{
    width: 420px;
    margin-top: 40px;
    font-size: 14px;
}
#down .b1{
    width: 240px;
    margin-right: 15%;

}
#code{
    background: #1992EF;
    width: 140px;
    height: 42px;
    line-height: 42px;
    position: absolute;
    top: 330px;
    right: 680px;
    font-family: PingFangSC-Regular;
    font-size: 14px;
    color: #FFFFFF;
    letter-spacing: 1px;
    cursor: pointer;
}


#down div:nth-child(3) input{
}
#down div:nth-child(4) input{
}
#down .b3{
    background: #1992EF;
    border-radius: 4px;
    color: white;
    font-size: 16px;

}